Check Engine - Off/on/off/on what..

[JHarris1385]

I have had this same problem since I bought the VX only about 2 months ago......The check engine light will be off for a couple days and then just stay on for a couple days and somedays it will come on and off randomly through out the day.

But I am also expeirincing rough starts and low MPG (about 13-14mpg 70% hwy driving too.) Still cant figure out the problem..

[LittleBeast]

I am having the EXACT thing happening and Autozone keeps saying it is a P0440 fault code and the Isuzu shop is still maintaining that it is probably just the gas cap being loose... Doing a search on here brings up some interesting things but none really give a definitive answer. I have already had my EGR replaced and just had the tubes connecting to it all cleaned 2 weeks ago, but maybe something is loose. It gave me the code only for a couple of days before the EGR and tube cleaning, but it has come back now. Other treads:
http://www.vehicross.info/forums/sho...&highlight=440
http://www.vehicross.info/forums/sho...&highlight=440
Hope that helps a little as I am still trying to be completely rid of this problem myself.
In Christ,
Ryan

[Corrosive]

I have to admit that my VX has a somewhat of a rough startup and my gas milage is the same as yours, but then again I think that the gas milage is normal.

Small update ---- I didnt mess with the cap at all and today it turned off while I was on my way to work. I didnt pull the battery or anything, it just turned off on its own.

I still plan to take it in to get an oil change/check fluids/and brakes on wed so we just might find out something that is wrong.

-Mike

Beast... do you think it may be the weather (remember that we live in the same city)? Mine has only started doing this once it started to get colder?

[JHarris1385]

I have pulled the code of

po300 random
multiple cylinder misfire

at Autozone

13mpg is common?, I was getting near 18 before the check engine light.

I HAVE NO IDEA what to do with this code and no one around me wants to work on or even look into the VX

[Corrosive]

Mine went away and has been gone for quite some time now. As far as finding a shop... just tell them its basically a trooper... I find it hard to believe that they will not work on it, its not something crazy like a lambo or something.
-Mike

[Sue777]

Interesting thought, Corrosive..... my "Check Engine" light went on Saturday and is still on, and it DID just start getting cold here in Connecticut.
Sue

[Corrosive]

Long term update: It has stayed off since the last post and the weather has been off and on here. I have been looking like a moron at every fill up though, cranking it so much that everyone looks at the guy making all the clicking noise, lol. It was the gas cap no doubt and I am glad that debockle is all over.
-Mike

[nfpgasmask]

Hey, if you are getting misfire codes, change out your sparkplugs and see if that helps...hopefully that will do it and it isn't something more serious.

Bart

I have pulled the code of

po300 random
multiple cylinder misfire

at Autozone

13mpg is common?, I was getting near 18 before the check engine light.

I HAVE NO IDEA what to do with this code and no one around me wants to work on or even look into the VX

[nfpgasmask]

I think the cold weather certainly does have an affect on the VX starting up. Mine has a weaker startup every morning since its been cooler outside. I usually let it idle for a couple minutes in the garage before I peel out down the street. Once it is warm, it starts up fine.

Bart

[JHarris1385]

So replace all my spark plugs aye? I would like to get the iridium ones but that would set me back another $60 im sure. I thought these were 100,000 mile spark pluggs? Any recommendation of pluggs to use? Thanks for anything.